Probably P/P for PvE. Not sure if he's going to prove all that useful in PvP. He only comes in P/P, P/S, and S/S, though, so all have some kind of use.

I just stuck with what I got the first time around (S/S), as farming Moonfang for a specific breed isn't realistic on a low pop server and I can't be bothered to make an alt elsewhere just to farm a P/P.